Been a creeper on here for some time but finally registered and this is my first post.
I recently bought a house with a few acres in Jamul, California. The lot is this decomposed granite and I am wondering if this stuff would be any good in a cob/adobe mix? If not what uses might it have for building purposes? I guess earthbags would be an idea but I like the cob better. If I cannot find a good clay source on the property where in SoCal is a good place to get clay?